Now Playing: Dashcam footage shows off-duty cop save baby
Now Playing: Cop adopts baby from homeless woman he helped on duty
Now Playing: Trooper pulls over cop who delivered him in 1991: ‘His mouth dropped — so did mine’
Now Playing: State trooper delivers baby on side of highway
Now Playing: US agents reportedly using tear gas at the Tijuana border
Now Playing: Kansas governor declares state of disaster emergency
Now Playing: Police kill 21-year-old believing he was a suspect in Alabama mall shooting
Now Playing: Home explosion in California injures a couple and infant daughter
Now Playing: Authorities claim to know where American missionary is buried
Now Playing: American consumers gear up for Cyber Monday sales
Now Playing: Police hunt for 2 suspects who set off fireworks on a porch as a prank
Now Playing: New experimental drug could reduce the number of dementia cases
Now Playing: Transplant recipient meets donor’s wife and daughter
Now Playing: Protests in Alabama after police shoot the wrong suspect in a mall
Now Playing: Online shoppers gear up for Cyber Monday
Now Playing: New details in the mysterious New Jersey quadruple homicide and mansion fire
Now Playing: Black Friday synonymous with markdowns and meltdowns
Now Playing: Boat crashes into ferry terminal
Now Playing: Consumers spent $7.8 billion shopping online during Thanksgiving and Black Friday
Now Playing: Tijuana mayor declares humanitarian crisis as 5,000 migrants enter town
Read More